Preparation method of oligomeric carboxylate chelating dispersant

A technology of chelating dispersant and oligomeric carboxylate, which is applied in the field of preparation of oligomeric carboxylate chelating dispersant, can solve the problems of rising production cost, high reaction temperature, long production cycle, etc., and achieve cost saving, The effect of low reaction temperature and short reaction time

Inactive Publication Date: 2014-02-19
广饶县多利多新型材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN1986581A / CN1085568A / CN1119404C all disclose the method for preparing sodium polyacrylate by aqueous solution method, but they either use mercapto alcohol with peculiar smell or use ternary oxidation-reduction initiation system, which is relatively complicated, or the reaction temperature is higher, and energy consumption , The production cycle is longer, which will increase the production cost or bring pollution to the environment

Method used

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  • Preparation method of oligomeric carboxylate chelating dispersant
  • Preparation method of oligomeric carboxylate chelating dispersant
  • Preparation method of oligomeric carboxylate chelating dispersant

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Reactant water sodium bisulfite Ammonium persulfate acrylic acid Weight g 165.8 14.43 1.28 120 weight ratio 1.4 0.12 0.01 1

[0022] Add 100g of water to a 500ml four-neck flask, add ammonium persulfate 0.64 (0.22% of the total amount of the system before neutralization), add 14.43g of sodium bisulfite (4.79% of the total amount of the system before neutralization), stir to dissolve, and control the temperature for 45 At -50°C, add an aqueous solution of 120g of industrial grade acrylic acid and 0.64g of ammonium persulfate (dissolved in 65.8g of water) dropwise simultaneously, and finish adding dropwise simultaneously within 50-60min. Keep warm for another 30 minutes, slowly add 40g of caustic soda, add about 65g of 45% NaOH to adjust the pH to 7-8, then press 8 parts of sodium polyacrylate, add 2 parts of ethylenediaminetetramethylenephosphonic acid, stir well, and adjust the pH to 7-8 with NaOH. After the pH is 6-8, add water to...

Embodiment 2

[0024] Reactant water Sodium metabisulfite sodium persulfate acrylic acid Weight g 186 20 1.6 120 weight ratio 1.6 0.17 0.013 1

[0025] In a 500ml three-neck flask, add 100g of water and 20g of sodium pyrosulfite and stir to dissolve, dissolve 1.6g of sodium persulfate in 86g of water and add to 120g of industrial grade acrylic acid, stir well and add to the dropping funnel to control the temperature at 30-40°C (no more than 40°C), 50-60 minutes to finish dripping, after dripping, control the material temperature to 35°C, keep warm for 1 hour, neutralize with about 180g of 40% sodium hydroxide solution, the temperature does not exceed 45°C, adjust the pH value to 7-8 , lower the temperature, add 7 parts of sodium polyacrylate and 3 parts of hydroxyethylidene diphosphonic acid, stir well, use NaOH to adjust the pH value to 6-8, add water to adjust the content to 40%, and then discharge to obtain the finished product. Measuring viscosity n...

example 3

[0027]

[0028] Add 128g of water and 18g of sodium bisulfite to a 500ml three-neck flask, stir well, dissolve, control the temperature at 45-50°C, add dropwise a mixed solution of 108g (1.5mol) of acrylic acid and 19.33g (0.166mol) of maleic acid, and add dropwise Dissolve 1g of sodium persulfate in 60g of water or an aqueous solution, control the temperature at 30-50°C, drop it for about 1 hour, keep it warm for 1 hour, neutralize it with 45% sodium hydroxide aqueous solution to a pH value of 7-8, and press 7.5 parts of sodium polyacrylate Add 2.5 parts of diethylenetriaminepentamethylene phosphonic acid and stir evenly, adjust the pH to 6-8 with NaOH, then adjust the solid content to 40% with water, discharge the finished product, measure the viscosity n 25 169mPa.s (No. 2 rotor, speed 60r.p.m, range 10-90%)

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Abstract

The invention belongs to the field of the preparation method of dispersant and particularly relates to a preparation method of an oligomeric carboxylate chelating dispersant. Oxidation-reduction initiation and chain transfer systems are adopted for reaction, water is used as the solvent, and the hydrosulphite, the sodium sulfite and / or the sodium pyrosulfite are used as the reductant and the chain transfer agent. The preparation method of the oligomeric carboxylate chelating dispersant comprises the following specific steps: (1) subjecting water-soluble monomers to homopolymerization and copolymerization under the action of the water, the initiator, the reductant and the chain transfer agent, and adjusting the pH value to 7-8 by using an alkali; and (2) adding a synergist, adjusting the pH vaklue to 6-8 by using an alkali, and adjusting the slid content to 38-40% by using water to obtain the finished product. The hydrosulphite, the sodium sulfite and / or the sodium pyrosulfite replace the isopropyl alcohol which is the mercapto compound with peculiar smell and odor to be used as the reductant and the chain transfer agent (molecular weight regulator), thus the step of recovering the solvent is omitted, the production efficiency is improved, the energy consumption is lowered, and the pollution is reduced. The product has low viscosity, high content of dispersed active matter and obvious dispersion effect, and the suspension is more stable.

Description

technical field [0001] The invention relates to the field of preparation methods of dispersants, in particular to a preparation method of oligomeric carboxylate chelating dispersants. Background technique [0002] Low molecular weight water-soluble polycarboxylate chelating dispersant, widely used in industries such as papermaking, coatings, printing builders, construction, pesticides, and scale inhibitors in industrial water systems. In the paper industry, it is used to disperse various pigments such as clay, china clay, calcium carbonate, talcum powder, titanium dioxide, aluminum hydroxide, zinc oxide, etc., to improve fluidity and realize pipeline transportation of pigments. [0003] The traditional process uses water and isopropanol as solvents, and the latter doubles as a chain transfer agent. This method has the problems of isopropanol recovery, energy consumption, time consumption, and high cost. If mercapto-based compounds such as mercaptoethanol and dodecanethiol a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/38C08F4/40C08F20/06C08F22/02C08F20/56C08F22/06C08F120/06C08F220/06C08F222/02B01F17/52C09K23/52
Inventor 刘玉峰王宝辉杨国刚李在荣唐林生
Owner 广饶县多利多新型材料有限公司
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